Mashael Al-Hegelan, MBBS

• Assistant Professor of Medicine

https://medicine.duke.edu/faculty/mashael-al-hegelan-mbbs

The role of the fallopian tube in the process of natural conception begins when the oocyte is released by the ruptured ovarian follicle and is picked up by the fimbrial end of the fallopian tube medicine cabinet with lights buy discount combivent line. It also facilitates the final maturation of sperm symptoms hiatal hernia combivent 100 mcg order mastercard, which have passed through the uterus symptoms endometriosis combivent 100 mcg mastercard. Both the sperm and oocytes are transported within the fallopian tube to the site of fertilization and meet within well-defined symptoms in early pregnancy 100 mcg combivent order with visa, species-dependent time limits symptoms kidney stones effective combivent 100 mcg. Fertilization takes place at the ampullary­isthmic junction, and the pre-embryo is transported to the uterine cavity at the optimum time for implantation. Significantly, the sperm and pre-embryo, which differ antigenically from the mother, are not attacked by the immune system. The mechanisms by which all these complex processes are controlled are not well understood. Ovum and embryo transport is probably the result of an interaction between the egg/embryo and the muscle contractions, ciliary activity and flow of tubal secretions. The relative importance of these factors is debatable, although there is evidence that ciliary activity plays a dominant role in gamete and embryo transport (Lyons et al 2006). Fallopian tubes probably act as sperm reservoirs, and this role may be essential for maintaining a certain number of sperm at the site of fertilization and preventing polyspermy by reducing the number of sperm available for fertilization. Sperm interaction with the tubal epithelium and secretions © may also play an important role in the preparation of sperm for fertilization (Saridogan and Djahanbakhch 2009). Tubal secretions contain proteins that derive from the plasma and also some specific substances synthesized within the oviduct itself (Maguiness et al 1992a). Both tubal proteins and the physical contact between the gametes and the tubal epithelium may play a role in gamete function. Aetiology of Tubal Disease Tubal disease is usually defined as tubal damage caused by pelvic infection such as pelvic inflammatory disease or tuberculosis, endometriosis, surgery or salpingitis isthmica nodosa, with varying degrees of tubal damage or obstruction, sometimes involving the adjacent ovary and the pelvic peritoneum, and adhesion formation. As a result, patients with tubal damage suffer from infertility and/or pelvic pain. This definition does not cover functional defects of the fallopian tube, as our ability to describe tubal disease is currently limited to demonstrating its patency and macroscopic normality. Salpingitis Most salpingitis is the result of an ascending infection from the lower genital tract, caused primarily by Chlamydia trachomatis and Neisseria gonorrhoeae (see Chapter 61, Pelvic inflammatory disease, and Chapter 62, Sexually transmitted infections, for more information). These micro-organisms cause mucopurulent endocervicitis, and break down major cervical barriers, such as the mucus plug that protects the endometrium and upper genital tract, and permits ascending infection. In a significant proportion of cases, no aetiological agent is identified; this suggests that a range of other aetiological agents have a role, but the identification of novel organisms is difficult to ascertain because of the limited availability of diagnostic tests. Serological evidence has associated Mycoplasma genitalium with pelvic inflammatory disease (Simms and Stephenson 2009). In the majority of patients, salpingitis is due to a sexually transmitted infection. In other cases, iatrogenic manoeuvres such as insertion of an intrauterine device, termination of pregnancy, hysterosalpingography or curettage can spread a cervical infection into the uterus and tubes. In a small proportion of women, pelvic infection may be secondary to gastrointestinal infections such as perforated appendicitis. Mycobacterium tuberculosis is still seen in developing countries; however, migration to developed countries has resulted in a significant increase in the number of tuberculosis notifications since the 1980s (Rose et al 2001). Acute salpingitis causes loss of ciliated cells and distal occlusion of the fallopian tubes. Some of the deciliation may be recovered later, but subsequent immune response following the acute phase causes permanent scarring, loss of mucosal folds and flattening of the mucosa (Lyons et al 2006). Distal occlusion of the tubes together with chronic inflammatory process could result in fluid collection in the lumen of the fallopian tube, leading to hydrosalpinges. Pelvic peritonitis during the acute phase may be followed by adhesions around the fallopian tubes and ovaries, distorting the pelvic anatomy. Othercauses Endometriosis, fibroids, previous pelvic/tubal surgery, salpingitis isthmica nodosa, endosalpingiosis and cornual polyps can be the cause of cornual obstruction or tubal damage. In some patients, tubal damage is secondary to previous tubal or pelvic surgery such as salpingotomy for ectopic pregnancy, ovarian cystectomy, myomectomy, ovarian wedge resection and shortening of round ligaments. Salpingitis isthmica nodosa was described by Chiari (1887) as nodular thickening of the proximal part of the fallopian tube. The aetiology of this entity is unknown but it is probably due to a noninflammatory process. Diagnosis Assessment of the fallopian tube should normally determine patency, a normal external and internal appearance, the ability to transport gametes and the embryo, and provision of an environment for the early steps of reproduction to occur. It is possible that, apart from the obvious need for tubal patency to allow passage of gametes, factors that affect the gametes and embryo, the effectors of tubal transport, the cilia, flow of tubal fluid and tubal contractions appear to constitute a higher-order system in which intact function of each may not be needed to achieve pregnancy (Verdugo 1986). Treatment may be the reason for unsuccessful tubal surgery even when tubal patency has been achieved. Similarly, a functional disorder of this system may account for subfertility in some cases of unexplained infertility. Currently, tubal function is determined by demonstrating patency and normal appearance at laparoscopy. The first two methods have been used for many years, whereas HyCoSy is a relatively new technique. All these methods have some degree of false-negative and false-positive results in determining tubal patency. Laparoscopy has the ability to identify peritubal adhesions, endometriosis, polycystic ovaries, and other pelvic and intra-abdominal pathology. However, it is usually performed under general anaesthesia and does not give information about the uterine cavity. Salpingoscopy is the transabdominal examination of the tubal lumen by introducing an endoscope through the fimbrial end. The presence of minor intratubal lesions is not necessarily incompatible with fertility (Maguiness and Djahanbakhch 1992); however, loss of mucosal folds and intratubal fibrosis are significant. Nowadays, salpingoscopic assessment of the tubal lumen is recommended by some groups before tubal surgery for hydrosalpinges (Puttemans et al 1998). De Bruyne et al (1989) proposed a classification of ampullary findings in hydrosalpinges: grades 1 and 2 refer to normal salpingoscopic findings, grade 3 (intermediate group) refers to focal adhesions, and grades 4 and 5 refer to severe adhesions and loss of mucosal folds. Transvaginal hydrolaparoscopy and fertiloscopy approaches utilize the advantages of laparoscopy but with a less invasive approach (Gordts et al 1998, Watrelot et al 1999). Transvaginal hydrolaparoscopy is the endoscopic examination of pelvic structures through the posterior vaginal fornix after instilling saline into the pouch of Douglas. This allows tubal patency to be checked, in addition to assessment of the pelvis for other pathology. Fertiloscopy includes salpingoscopy, microsalpingoscopy and hysteroscopy for complete examination of the female reproductive tract. Selective transcervical salpingography and tubal catheterization can be done in cases where it is doubtful that there is cornual obstruction (Ataya and Thomas 1991). Irregular vessels seen on the peritoneum surface as a result of previous inflammation (arrow). However, it is relatively expensive, labour intensive and carries risks of multiple pregnancy and ovarian hyperstimulation syndrome (see Chapter 22, Assisted reproduction treatments, for more information). Cornual occlusion Cornual occlusion due to inflammatory causes was treated by uterotubal implantation with very poor results. Ehrler (1963) described his technique and suggested that the intramural portion of the tube could be spared in most patients. Microsurgical methods described by Winston (1977) and Gomel (1977) became the surgical technique of choice. Destroying a possible sphincter at the uterotubal junction is associated with excessive bleeding and damage to the tubal blood supply; it shortens the tube and may increase the risk of rupture of the uterus in the event of subsequent pregnancy, which means that patients must be delivered by caesarean section. The use of magnification allows better identification of the intramural portion of the tube by careful shaving of the cornua until healthy tissue is found, permitting a more accurate tissue apposition with a watertight anastomosis between healthy tubal tissues. Once the ends are well defined, the anastomosis is done in two layers, using 8/0 nylon as a suture. The suture material should not penetrate the mucosa, only the muscularis (Seki et al 1977). A stitch of 6/0 Prolene between both ends of the mesosalpinx should be applied as a stay suture. More details about the technique have been given elsewhere (Winston 1977, Margara 1982). A review of the literature on fluoroscopic tubal cannulation showed pregnancy rates of 22. However, this type of surgery is still appropriate and effective for properly selected individuals (National Institute for Clinical Excellence 2004). The use of magnification and microsurgical techniques has been the traditional method. However, with advances in laparoscopic surgery, most of these methods are now possible to perform at laparoscopy. In some of them, the surgical freeing of the ovaries and tubes from adhesions can give symptomatic relief. Microsurgicaltreatment the microscope was first used for tubal surgery by Walz (1959). Whilst others used delicate electrosurgery and magnification (loupes) in the treatment of hydrosalpinges, Paterson and Wood (1974) in Australia and Winston and McClure-Browne (1974) in England adapted their experience from animal experiments to humans and operated on infertile women, under high magnification, using an operating microscope. The use of the microscope was originally much debated, but microsurgery is now well established and is a routine procedure for tubal infertility. Glazener et al (1987) stated that the removal of cornual polyps does not improve fertility and they are not a cause of infertility. However, consideration should be given to removal of large polyps present in the intramural or isthmic portion of the tube. This can involve salpingotomy and resection of the polyp without tubal resection or the opening of the cornu, and removal of the affected portion of the tube followed by cornual­isthmic anastomosis in two layers. In some cases when a large polyp is implanted deep in the intramural portion of the tube, the anastomosis can be difficult due to disparity of the lumen of the tubal ends. The portion where the polyp was present is wider than the isthmic portion of the tube, and it is not always easy to achieve a watertight anastomosis. Coadjuvants the use of coadjuvants can sometimes help to avoid adhesion formation, but it is important to keep in mind that no coadjuvant will replace good surgical technique. C D diminished in a linear fashion depending on the length of the ampulla resected; when more than 70% was missing, none of the animals became pregnant. Resection of the ampullary­isthmic junction did not appear to alter fertility (Winston et al 1977). The rabbit is far from an ideal model for human tubal physiology, but these results emphasize the fact that the ampulla seems to be important in maintaining fertility. The length of time between sterilization and reversal is important and has a prognostic value. Vasquez et al (1980) demonstrated that after 5 years of sterilization, the proximal portion of the tube had a severely damaged mucosa with flattening of the epithelium and polyp formation. The surgical technique of reversal of sterilization has been described by Winston (1977) and Margara (1982). The hydrosalpinx fluid is known to be embryotoxic and may also reduce endometrial receptivity. In animal experiments, fertility 24 Tubal disease the chance of tubal surgery (Puttemans and Brosens 1996). A Cochrane review concluded that further randomized trials are required to assess other surgical treatments for hydrosalpinx, such as salpingostomy, tubal occlusion or needle drainage of a hydrosalpinx at oocyte retrieval (Johnson et al 2004). In some cases, where the tube is completely free of adhesions, the use of loupes is sufficient. Division of adhesions between tube and ovary or other pelvic organs is very important in order to leave the tube fully mobile, with the possibility of the new ostium being able to cover the whole ovarian surface and making egg pick-up more likely. While dividing adhesions, special care must be taken to avoid damage to the fimbrial blood supply. These vessels are in the area of the connecting ligament between the ovary and the tube at the outer margin of the mesosalpinx. This is where the fimbrial end has closed; it is clearly seen under the microscope as a thin fibrous line, often with an H-shaped configuration, and is not always the thinnest part of the tube. Using fine diathermy, the tube is opened and a glass probe is introduced, following the fibrous tracts parallel to the blood vessels and ensuring that the mucosal folds are not cut. If the ovarian surface is damaged during the division of adhesions, the raw area is repaired using fine non-absorbable suture material to avoid recurrence of adhesions. Adhesions Omental adhesions are not infrequent and when they are more than minimal, a partial omentectomy is performed. It is not used as a routine procedure, but seems to be a very effective way of avoiding recurrent adhesions in the pelvis. The most frequent adhesions are between the ampulla, the ovary and the mesosalpinx. Using a glass probe, the adhesions are hooked and incised with monopolar diathermy. The use of the microscope simplifies the process because the peritoneal edges can be seen easily. If the tubal peritoneum is incised, it must be repaired using 8/0 nylon as the suture material. Ovarian adhesions should be removed from the ovarian capsule using diathermy or scissors, leaving the ovarian capsule as free as possible. If the ovarian fossa has been damaged in order to free or liberate a firmly adherent ovary, the raw area should be closed using a linear suture of 4/0 Prolene.

Imaging Indications and Algorithm Arteriography is the gold standard for diagnosis and anatomic evaluation of acute limb ischemia medications zanaflex buy 100 mcg combivent. Access for diagnostic arteriography should be established at a site distant from the presumed occlusion to avoid any subsequent need for thrombolytic delivery in the region of the arteriotomy symptoms 4 weeks 3 days pregnant purchase combivent 100 mcg with amex. Arteriography is often performed intraoperatively in the setting of a pulseless extremity symptoms lactose intolerance combivent 100 mcg order with amex. The arteriogram should include examination of both inflow and outflow anatomy as well as study of the runoff vessels into the foot symptoms of anxiety buy combivent 100 mcg low price. In the case of embolic ischemia treatment genital herpes generic combivent 100 mcg with mastercard, arteriography will demonstrate minimal atherosclerotic disease, a sharp cutoff of the artery at the site of occlusion, and few collateral vessels. Meanwhile, if the acute event is thrombotic in nature, angiography will most often reveal diffuse atherosclerotic disease, irregular and tapered cutoffs, and a well-developed collateral circulation. Differential Diagnosis Acute arterial occlusion causing acute limb ischemia is difficult to confuse with other pathologic conditions. That said, there are some not uncommon pitfalls in patients presenting with pulseless, cool, painful extremities. In patients suffering from aortic bifurcation saddle embolus, the diagnosis is frequently missed, as discussed before. These patients are often evaluated for possible neurologic or neurosurgical problems owing to the bilateral paralysis on presentation, resulting in a delay of diagnosis and appropriate therapy. Aortic dissection can cause acute arterial insufficiency of one or both legs and must be considered in any patient presenting with a cold pulseless limb and abdominal, back, or chest pain. In some cases, percutaneous aspiration or mechanical thrombectomy is used before and in conjunction with thrombolysis. It is essential that any stenoses revealed on arteriography after thrombolysis be treated with angioplasty, bypass graft revision, or revascularization. In the interim from completion of thrombolysis until intervention directed at flowlimiting lesions, heparin infusion must be continued. Maintenance intravenous fluids should be initiated and the patient kept nil per os. Consideration should be given to either oral acetylcysteine14 or bicarbonate infusion15 if the patient has chronic renal insufficiency or diabetes because diagnostic or completion angiography will likely be indicated. Temperature extremes and fluctuations should be avoided; cold temperatures cause vasoconstriction, and heat causes increased tissue metabolic demands. Transfusion and optimization of cardiac output should be accomplished whenever these might result in improved oxygenation of the affected limb. Stents were placed in the newly patent left iliac limb to displace residual thrombus and to treat any stenoses that might have contributed to the thrombosis. Aortic occlusion may result from aortic saddle embolus, in situ thrombosis of an atherosclerotic abdominal aorta, thrombosis of an abdominal aortic aneurysm, or aortic dissection. It is important to establish the etiology of aortic occlusion because balloon catheter embolectomy through a femoral cutdown (see later) is usually successful in the setting of saddle embolus but is infrequently helpful in patients with in situ thrombosis of a chronically diseased abdominal aorta. In the latter scenario, the limbs are usually not profoundly ischemic owing to the chronic nature of the disease and resulting extensive collateralization; these patients may require aortobifemoral grafting to reestablish lower extremity perfusion. Acute unilateral iliac occlusion can occur in patients having undergone prior aortic aneurysmorrhaphy with a bifurcated graft, prior aortobifemoral reconstruction, or prior abdominal aortic stent grafting. In these situations, the surgeon may be able to restore patency of the graft limb with balloon thrombectomy performed from a groin incision, but a technical problem in the affected limb and graft stenosis must be suspected and subsequently addressed. Symptomatic popliteal aneurysms generally present with limb ischemia-from aneurysm thrombosis or distal thromboembolism-rather than with rupture. The diagnosis should be suspected in any patient with acute or chronic ischemia of the leg and a palpable firm pulseless (in the case of thrombosis) or pulsatile mass behind the knee. Treatment of a popliteal aneurysm presenting with acute limb ischemia consists of emergent catheter-directed thrombolysis to reestablish distal arterial patency20 and subsequent surgical exclusion and bypass; resection of the aneurysm is not necessary. There is also an emerging experience with covered stents for treatment of popliteal aneurysms. In patients suffering from thrombotic arterial occlusions and in those whose thromboembolism cannot be extracted or lysed, arterial bypass grafting may be necessary to treat stenotic or occluded vascular segments. Surgical arterial bypass and other revascularization procedures are detailed in Chapter 114. Chronic limb ischemia presents as a spectrum of disease from asymptomatic to claudication to critical limb ischemia. This spectrum is encapsulated in two similar staging systems for peripheral arterial disease: Fontaine stages and Rutherford categories (Table 113-4). Symptomatic patients with peripheral arterial disease generally present with either intermittent claudication or critical limb ischemia. Intermittent claudication is defined as muscle discomfort in the lower limb reproducibly produced by exercise and relieved by rest within 10 minutes. Critical limb ischemia is defined as persistent, recurring ischemic rest pain requiring opiate analgesia for at least 2 weeks with ulceration or gangrene of the foot or toes. Hence, Rutherford categories 4 through 6 comprise those patients with critical limb ischemia. However, the rational construct differentiating patients with immediately threatened limbs and those with chronically threatened legs is clinically useful. Prevalence and Epidemiology Intermittent claudication has a prevalence of approximately 3% in 40-year-olds and about 6% in 60-year-olds. However, continued smoking or coexistent diabetes portends worse clinical outcomes for claudicants, including more frequent eventual amputation. Critical limb ischemia has an incidence in the United States of approximately 1000 new cases per 1 million population. More than half of patients with critical limb ischemia undergo attempts at revascularization as definitive treatment; regardless, significant numbers of patients lose their limbs or die within 1 year. Risk factors for peripheral arterial disease include smoking, diabetes, hypertension, chronic renal insufficiency, African-American race, male sex, hyperlipidemia, and hyperhomocysteinemia. Again, the importance of chronic limb ischemia as a marker for atherosclerotic cardiovascular disease cannot be overstated. The 5-year mortality rate is 30% for patients with claudication and 70% for patients with critical limb ischemia. Etiology and Pathophysiology Peripheral arterial disease most commonly results from atherosclerosis of the distal arterial tree. Patients with intermittent claudication have normal blood flow to the limb at rest; but with exercise, the occlusive arterial disease prevents proper augmentation of blood flow, resulting in insufficient oxygen delivery to the muscles and the symptoms of claudication. Critical limb ischemia represents more advanced occlusive peripheral arterial disease in which oxygen delivery to the lower limb is suboptimal even at rest. Manifestations of Disease Clinical Presentation Intermittent Claudication Patients with intermittent claudication describe fatigue, aching, or cramping in the muscles of the leg that develops after walking a consistent established distance (or other exercise) and that resolves with rest. These symptoms most often appear in the calf but can affect the thigh or buttocks. The anatomic site of pain frequently corresponds to the level of occlusive disease; symptoms typically present in muscle groups one joint level below the region of arterial occlusion. Thus, calf muscle claudication is most commonly due to superficial femoral artery occlusion; hip, thigh, or buttock claudication is most commonly due to more proximal aortoiliac disease. The blood pressure should be measured in both arms and the ankle-brachial index in each leg. The abdomen is palpated in an attempt to detect an abdominal aortic aneurysm as a potential embolic source (although physical examination is only 50% sensitive for abdominal aortic aneurysms 4 to 5 cm in diameter). The peripheral vascular examination comprises palpation of the radial, ulnar, brachial, carotid, femoral, popliteal, dorsalis pedis, and posterior tibial pulses. Auscultation of the carotid, abdominal aorta, and iliac arteries and femoral artery can suggest occlusive vascular disease. In addition, the skin of the legs should be assessed for skin color, temperature, or decreased hair growth and the muscles of the leg for ischemic atrophy. As suggested before, ankle-brachial indices constitute a first diagnostic test in patients thought to have intermittent claudication. First, the systolic blood pressure is measured in each arm, and the higher is taken as the brachial pressure. The cuff is then placed on the calf, inflated, and then slowly deflated; the highest pressure at which the Doppler signal-at either the posterior tibial or dorsalis pedis-becomes audible again marks the ankle pressure. Critical Limb Ischemia Patients with critical limb ischemia present with some combination of ischemic rest pain, nonhealing ulcers, and gangrene. Ischemic rest pain is severe, is intolerable, sometimes improves with lowering of the affected limb (dangling the foot over the edge of the bed), and is responsive only to narcotic analgesics. The pain is often worst at night (when the limb is elevated), sometimes wakes the patient from sleep, and is sometimes transiently relieved by rubbing the foot. Except in cases of diabetic neuropathy and resulting anesthesia of the foot, patients with tissue loss of the lower extremity also often present with pain, localized to the wound. Ulcers and gangrene usually affect the toes, the heel and ankle, and, in severe cases, the distal foot proper. In those patients with critical limb ischemia and diabetes mellitus, the peripheral neuropathy often contributes to the trauma initiating ulcer formation and to the delayed recognition of the wound by the patient. The microvascular derangement of diabetes predisposes to nonhealing of these wounds and to the subsequent development of infection (wet gangrene). Complications of diabetic foot ulcers, including gangrene, are the most common cause of nontraumatic leg, foot, and toe amputation. Up to 15% of diabetic patients will suffer from a foot ulcer during their lives, and 15% to 25% of these will require an amputation at some level. The location and appearance of the ulcer or gangrene can provide the astute clinician a suggestion as to the etiology of the wound. The putative diagnosis of critical limb ischemia should be confirmed by measuring ankle-brachial indices. Symptoms of rest pain commonly occur in patients with ankle pressures below 50 mm Hg. Peripheral arterial disease often impairs healing in leg ulcers caused by trauma, venous insufficiency, or neuropathy, and augmented blood flow (above that which would cause rest pain) is required to heal wounds or infections; therefore, ankle pressures below 70 mm Hg are suggestive of critical limb ischemia in patients with ulcers or gangrene. Subsequently, pulse volume recordings may be performed by use of a plethysmograph in a vascular laboratory. This device measures volume changes in the limb at various levels with multiple blood pressure cuffs. Pulse volume recordings can localize arterial occlusive disease with up to 85% accuracy compared with angiography. Imaging Indications and Algorithm In patients with peripheral arterial disease in whom revascularization is indicated or considered, radiologic studies should be entertained. Ultrasonography Duplex ultrasonography is noninvasive and does not require the administration of contrast material or other medication. It is highly sensitive and specific for identification of stenoses in bypass grafts. Ultrasound studies are somewhat dynamic and technologist dependent by their very nature, and thus objective results and images are not as portable or reproducible as in other imaging modalities. Nevertheless, Duplex ultrasonography is greater than 80% sensitive and specific for iliac, femoropopliteal, and infrapopliteal disease. Intravenous iodinated contrast material must be administered in significant doses (approximately 150 mL is normally used for a study of the abdominal arteries and bilateral lower limb runoff vessels), making this study less useful in those with chronic renal insufficiency. Often, an anatomically focused catheter x-ray arteriography will require a much smaller dose of iodinated contrast agent. These measures may include smoking cessation, cholesterol lowering with diet modification and prescription of statin medications, reduction of hemoglobin A1c, treatment of hypertension, and institution of antiplatelet therapy. The treatment goals for patients with intermittent claudication are to relieve symptoms and to improve exercise capacity and the ability to perform activities of daily living. The treatment strategy may incorporate exercise rehabilitation as well as one of any number of medications demonstrated to improve exercise tolerance and quality of life, including cilostazol and pentoxifylline. The goals of therapy for patients with critical limb ischemia are to relieve pain, to heal ulcers, to prevent limb loss, to improve quality of life, and to prolong survival. To accomplish amputation-free survival, most patients will require revascularization. While work-up is under way and in those patients in whom revascularization is not an option, pain control and ulcer healing are primary therapeutic goals. In addition, recent reports and concern relative to gadolinium-induced nephrogenic systemic fibrosis have limited its applicability in patients with severe chronic renal insufficiency who are not on dialysis. Angiography the expense and risks of arteriography-including contrast allergic reaction, contrast-related renal failure, arterial dissection, atheroembolization, pseudoaneurysm, arteriovenous fistula, and bleeding-are not insignificant. However, this technique is unsurpassed for providing a "road map" for revascularization, and it is often accomplished in one procedure with endovascular or open revascularization. Recent advances in and widespread adoption of endovascular therapy for peripheral arterial disease have lowered the threshold-in some practices-for attempted revascularization in patients with intermittent claudication. Meanwhile, revascularization is indicated and necessary in those patients with critical limb ischemia. Specific approaches and techniques for revascularization are discussed in Chapter 114. Infection of the gangrenous toes, heel, foot, or leg in diabetic patients and in those with critical limb ischemia is often polymicrobial and present anywhere in the spectrum of local superinfection of preexisting ulcers to gas gangrene or necrotizing fasciitis of the leg. Principles of care include the initiation of broad-spectrum intravenous antibiotics until the organisms and their sensitivities are defined and the coverage can be narrowed. Frequently, toe or forefoot amputations are undertaken to eliminate necrotic or infected tissue. When they are combined with temporally proximal revascularization, these amputations are classified as salvage procedures, Differential Diagnosis the causes of chronic leg ischemia apart from atherosclerosis include arteritis, popliteal artery entrapment, mucinous cystic degeneration, Buerger disease (thromboangiitis obliterans), Takayasu disease, aortic coarctation, popliteal aneurysm (with secondary thromboembolism), other embolic disease, fibromuscular dysplasia, pseudoxanthoma elasticum, thrombosis of persistent sciatic artery, endofibrosis of the external iliac artery (iliac artery syndrome in cyclists), and primary arterial tumors. The differential diagnosis of intermittent claudication includes venous insufficiency, nerve root compression (sciatica or lumbar radiculopathy), symptomatic Baker cyst, chronic compartment syndrome (usually in heavily muscled athletes), spinal stenosis, hip arthritis, ankle arthritis, and foot arthritis. In the case of critical limb ischemia with tissue loss, other causes of or factors contributing to the ulcer or gangrene must be considered. Not uncommonly in diabetic patients, toe amputation will be undertaken in the setting of unrevascularizable peripheral arterial disease or minimal peripheral arterial disease; diabetic neuropathy and vasculopathy are the causes of these gangrenous toes, and revascularization is not indicated. Acute limb ischemia is a surgical emergency and is most often due to thromboembolus or acute thrombotic occlusion of a native artery or bypass graft.

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Treatment with metformin is mainly associated with gastrointestinal side-effects medications causing hyponatremia proven combivent 100 mcg, including nausea symptoms exhaustion order combivent in united states online, vomiting symptoms 6dp5dt buy combivent 100 mcg lowest price, diarrhoea and abdominal cramps medicine prescription drugs purchase cheap combivent. Otherdrugs Other insulin-sensitizing agents tried in the management of anovulatory infertility include the thiazolidinedione hypoglycaemic drugs treatment brachioradial pruritus combivent 100 mcg purchase with mastercard. Rosiglitazone and pioglitazone are newer drugs used for the treatment of type 2 diabetes mellitus. Regular monitoring of liver enzymes is recommended, as these drugs may also have hepatotoxic effects. The most commonly used is metformin, a biguanide oral hypoglycaemic drug used for the treatment of type 2 diabetes mellitus. Metformin has been proven to reduce serum insulin and androgen concentrations, and improve ovulation rates and hirsutism (Lord et al 2003). Metformin has been used as an ovulation induction agent in many trials; nevertheless, these trials are characterized by heterogeneity in terms of dosage, timing and duration of treatment (Al-Inany and Johnson 2006). They concluded that there were no significant differences in ovulation, ongoing pregnancy or miscarriage rates. Nevertheless, a large proportion of women in the metformin group discontinued treatment because of side-effects. It is the treatment of choice for women with hypogonadotrophic hypogonadism with an intact pituitary function (Braat et al 1991). Subsequently, follicular recruitment and growth proceed as in a normal menstrual cycle, leading to the development of a single dominant follicle (Martin et al 1993). The intravenous route is preferred by some authors as it mimics the physiological spikes of the hormone and, therefore, is more 239 17 Ovulation induction physiological, requires lower doses and is more cost-effective than the subcutaneous route of administration. Monitoring is performed with regular serum oestradiol measurements and pelvic ultrasound every 3­4 days. Preparations A number of preparations of exogenous gonadotrophins exist but not all are still available in every country. The initial preparations were crude as they contained significant amounts of non-gonadotrophin proteins; moreover, they had to be administered intramuscularly. Ovulation rates and pregnancy rates per treatment cycle of 70­93% and 18­29% have been reported (Braat et al 1991, Martin et al 1993, Filicori et al 1994). This risk is significantly lower than that associated with gonadotrophin treatment (approximately 15%) (Martin et al 1993). Still-significant amounts of nongonadotrophin proteins were present and the preparation had to be given intramuscularly. Nevertheless, many women are reluctant to use this treatment as it requires maintenance of an indwelling cannula for a long period of time; moreover, cases of infection at the site of the cannula have been reported. These seem to be more serious with the intravenous route of administration, whilst the subcutaneous route is mainly associated with local inflammation at the site of needle insertion. Gonadotrophins are considered highly effective in inducing ovulation in these groups of patients. Nevertheless, their use has been associated with risks of multiple pregnancy and ovarian hyperstimulation. Thus far, research indicates that different gonadotrophin preparations are equally effective. Nevertheless, recombinant gonadotrophins have certain advantages in comparison with urinary products. They have high batch-to-batch consistency, unlimited supply, high purity and are associated with less risk of allergic reaction as they do not contain any non-gonadotrophin proteins. Thus, when deciding which preparation to use, factors such as patient safety, cost and drug availability must be taken into consideration (Table 17. The choice of therapeutic regimen will depend on the underlying cause of infertility. Hypogonadotrophic hypogonadism Women with hypogonadotrophic hypogonadism have extremely low levels of endogenous gonadotrophins. Therefore, relatively low doses of gonadotrophins are needed for ovulation induction. Luteal phase support is not routinely required but, if needed, progesterone support is preferred. If this treatment is continued during gonadotrophin administration, premature luteinization may be prevented. This is assessed by serum oestradiol concentration and transvaginal ultrasonography. The frequency of monitoring may be intensified, depending on oestradiol levels and the size or number of the growing follicles. Ovulation usually occurs after 36­48 h and couples are advised to have intercourse on the day of the injection and the day after. When non-purified preparations are used, their administration may be associated with an increased risk of local reaction (at the injection site) or, on rare occasions, with a severe anaphylactic reaction. In this case, consideration should be given to switch to recombinant gonadotrophin preparations. As the number of obese women is increasing, Surgical management: laparoscopic ovarian drilling so is the prevalence of the disease among those who seek fertility treatment. These include menstrual disorders, infertility, miscarriage and obstetric complications, both fetal and maternal. It appears that it is not only the increased amount of fat per se, but also the fat distribution that is related with these disorders. Thus, an increased waist:hip ratio has a more important effect on fertility than weight alone. The exact mechanism through which obesity impairs ovarian function, and thus fertility, is largely unknown. It seems that obesity causes low sex-hormone-binding globulin concentrations, hyperandrogenaemia and hyperinsulinaemia. High leptin levels cause a reduction in insulin-induced steroidogenesis in granulosa and theca cells. On the other hand, adiponectin levels decrease in obesity, leading to insulin resistance. Thus, hyperinsulinaemia may be due to the effects of low adiponectin levels and increased resistin levels. The resulting hyperandrogenaemia is caused by the inhibition of sex-hormone-binding globulin and insulin-like growth factor binding protein-1. As far as fertility is concerned, large retrospective studies have shown a link between obesity and anovulation. Anovulation seems to be the result of hyperandrogenaemia and increased levels of leptin. The impact of obesity on assisted conception techniques has also been investigated. In this group of patients, weight reduction improves biochemical indices and fertility rates. A 5­10% decrease in body weight will lead to a 30% reduction in body fat, which is sufficient to restore regular menstruation and ovulation. Weight reduction led to resumption of ovulation and subsequent pregnancy, as well as a reduction of testosterone levels and increased sexhormone-binding globulin concentrations. Nevertheless, the management of obesity is difficult and requires a multidisciplinary approach. This would include modification of their dietary quality and change in physical activity. If this fails, pharmacotherapy ought to be considered and, ultimately, obesity surgery. If there is an underlying eating disorder, psychopathology should also be taken into consideration and appropriate referrals made. Pharmacotherapy includes two main groups of drugs: peripherally acting and centrally acting drugs. This medication inhibits gastric and pancreatic lipase and, therefore, reduces fat absorption from the intestine. Although it is generally well tolerated, it can cause gastrointestinal disturbances, which consequently lead to low patient compliance. The second category of drugs includes sibutramine, which inhibits serotonin and noradrenaline reuptake. It can cause a greater reduction in insulin levels and insulin resistance compared with metformin. As far as bariatric surgery is concerned, laparoscopic adjustable gastric banding remains the mainstream therapy. Nonetheless, further research is required in order to establish its role in improving fertility. After the procedure, contraception is required until the target weight is reached. It was speculated that by removing part of the hormone-producing ovarian tissue, androgen and inhibin levels would be reduced. Nevertheless, the response rate was variable and the procedure was abandoned largely because of the risk of postoperative adhesion formation. As soon as effective medical methods of ovulation became available, ovarian wedge resection became obsolete. Both laparoscopic ovarian cautery and laser vaporization (using carbon dioxide, argon or neodymium:yttrium aluminium garnet lasers) have been used since. The aim is to create approximately 10 holes per ovary in the ovarian surface and 243 17 Ovulation induction stroma. The mechanism of action is thought to be similar to that of ovarian wedge resection. Therefore, disturbances in the ovarian­pituitary feedback mechanism are corrected, leading to follicular recruitment, maturation and ovulation. In the literature, most data derive from randomized controlled trials comparing ovarian drilling with ovulation induction using exogenous gonadotrophins. Moreover, there was no evidence of a difference in clinical pregnancy rate, miscarriage rate, ovulation rate and quality of life. Its use is not recommended as an attempt to decrease the risk of developing diabetes mellitus or coronary artery disease. It is believed that the increased vascular permeability is the result of vasoactive agents released by the hyperstimulated ovaries. In more severe forms, ovaries become cystic and there is abdominal distention with pain, nausea, vomiting and diarrhoea. This may be followed by ascites, pleural effusion and, on rare occasions, pericardial effusions. There is marked intravascular volume depletion with haemoconcentration that may lead to severe manifestations, including thromboembolism, severe hypoalbuminaemia, hypovolaemia, oliguria and electrolyte disturbances. As the management of the condition will be dictated by its severity, it is mandatory to assess each case properly and classify it according to Table 17. It is a systemic disease resulting from vasoactive products released from hyperstimulated ovaries. Further research is required in order to evaluate their positive predictive value and possible future use. In the latter case, the couple should be advised to refrain from intercourse or to use barrier methods of contraception. A possible explanation could be that ovaries of younger women are more responsive to gonadotrophins, as they contain a higher number of gonadotrophin receptors and a larger number of follicles responding to gonadotrophins. Usually, this takes 7 days in non-pregnant women and 10­20 days in pregnant women. A physical examination, including body weight, abdominal girth measurements, abdominal and cardiorespiratory examination, and assessment of hydration, must be performed. A pelvic ultrasound will help to assess the size of the ovaries and check for ascites. Blood tests should include full blood count, urea and electrolytes, liver function tests and clotting screen. If pericardial effusion is suspected, an electrocardiogram and echocardiogram will be essential. Non-steroidal anti-inflammatory drugs are contraindicated, as they may compromise renal function. Nevertheless, urgent reassessment is warranted if the woman develops severe abdominal pain, increasing abdominal 245 17 Ovulation induction of 2­3 l/day. In the case of haemoconcentration, more intensive hydration is needed; if the problem persists, colloid therapy needs to be considered. Colloids that have been used for this purpose include human albumin, dextran, Haemaccel, 6% hydroxyethylstarch and mannitol. In cases of increasing abdominal distention or persistent oliguria, an ultrasoundguided paracentesis should be considered. Drainage of ascitic fluid provides rapid symptomatic relief from pain and dyspnoea, and is followed by a significant improvement in urine output. Intravenous colloid replacement should be considered in order to avoid cardiovascular collapse. This will include full-length venous support stockings and subcutaneous prophylactic heparin. Monitoring of these patients should include: Multiplepregnancy In many developed countries, there has been a 30­50% increase in twin births since 1980. The number of multiple pregnancies conceived is even higher, as spontaneous and iatrogenic fetoreductions are not included in birth statistics. Multiple pregnancies are high risk as they carry risks for both the mother and the fetus.

If uterine atony continues after these causes are excluded symptoms 11 dpo discount combivent 100 mcg online, further medical treatment includes the use of rectal misoprostol medications with sulfur purchase combivent line, which may be effective in increasing uterine tone medicine 751 m discount 100 mcg combivent with visa. Surgical management of continuing postpartum haemorrhage Uterine artery ligation has minimal complications and reduces the pulse pressure by 60%­70% to allow endogenous haemostatic mechanisms to control bleeding medications not to mix purchase combivent from india. Uterine compression sutures B-Lynch sutures used to compress the uterus are often effective medications vascular dementia 100 mcg combivent order visa. If it is not due to placenta praevia, a subtotal hysterectomy may be the operation of choice, as there is a higher maternal mortality with total hysterectomy. Secondary postpartum haemorrhage is fresh bleeding from the genital tract after the first 24 hours but before 6 weeks postpartum. Causes · infection · retained products of conception · placental site subinvolution · this includes abdominal and vaginal examination to confirm involution of the · Vaginal uterus and closed external cervical os. Investigation Management · antibiotics: suitable empirical cover for mixed genital flora, including amoxycillin/ · evacuation of retained products · uterotonic agents, including oxytocinon and misoprostol potassium clavulanate 500 mg every 8 hours Summary of management of severe obstetric haemorrhage · prompt restoration of circulatory volume · accurate diagnosis of cause · appropriate treatment to stop bleeding early Amniotic fluid embolism Incidence. Pathophysiology Amniotic fluid embolism can occur in any trimester and is due to changes in the normal anatomical relationship between the membranes, placenta and uterine wall, with disruption of the integrity of the uterine blood vessels. In the maternal circulation, the amniotic fluid/debris is deposited in the lungs and causes pulmonary vasoconstriction, which is probably due to an anaphylactic-type reaction to the amniotic fluid/debris. Severe hypoxia occurs with acute left-sided heart failure; disseminated intravascular coagulopathy may also occur. Risk factors · hypertonic uterine action · caesarean section · polyhydramnios · precipitate labour 220 Obstetrics · advanced maternal age · grand multiparity Presentation and diagnosis · There is sudden collapse after rupture of membranes in labour with dyspnoea, pink frothy sputum and cyanosis, leading to shock and apnoea. Management · securing airways and ventilating · treating cardiovascular collapse · central venous line · acute left ventricular failure: digoxin · vasopressins: dopamine/dobutamine · correcting coagulopathy · treating metabolic/electrolyte abnormalities · watching for infection · intensive care Thromboembolism and pulmonary embolism (See Ch 47 for further details. Increased susceptibility in the pregnant woman is due to: · increased blood flow to the spinal cord · reduced epidural space because of distended vessels · a rise in pressure in the epidural space with uterine contractions 42 · Labourwardemergencies 221 Presentation · Signs and symptoms may occur almost immediately and within up to 20 minutes · Patient complains of metallic taste, tinnitus, confusion and disorientation. Management · prevention · intubation and ventilation · fluid resuscitation Eclampsia (See Ch 45 for further details on eclampsia/pre-eclampsia. Presentation · Presentation includes hypertension, hyperreflexia and clonus, headache, visual changes and seizures. Management · secure airway; ventilate if necessary · stop seizure and prevent recurrence · control blood pressure · diagnose and correct coagulopathy · prevent pulmonary oedema; maintain strict fluid balance Inverted uterus An inverted uterus occurs when the fundus of the uterus descends through the uterine body, cervix and vagina. Risk factors · excess maternal weight gain · association with gestational diabetes, with estimated fetal weight >4000 g · unexplained intrauterine fetal death · high maternal birthweight · postdates: a 20% incidence of macrosomia with infants delivered at 42 weeks compared with 12% delivered at 40 weeks · intrapartum risks: 45% diagnosed with failure to progress and prolonged second stage Management staff. Mild shoulder dystocia · Suprapubic pressure will force the shoulder into the oblique diameter of the pelvis. Moderate shoulder dystocia · Hibbard manoeuvre: press firmly against the head, jaw and upper neck, and direct the head towards the rectum. This serves to straighten the sacrum relative to the lumbar spine and cause superior rotation of the symphysis. More Aboriginal or Torres Strait Islander mothers have their babies at a younger age compared with non-Indigenous mothers. Background facts Every day 1500 women die from pregnancy-related or childbirth-related conditions in the world. A woman living in sub-Saharan Africa has a 1 in 16 chance of dying in pregnancy or childbirth. The World Health Organization estimates that more than 80% of maternal deaths could be prevented through actions that have been proven to be effective and affordable, including: access to voluntary family planning to ensure that births are spaced properly, skilled attendance at delivery, aseptic birth environments, identification of maternal/fetal/neonatal complications, and minimal delay in reaching a medical facility or in receiving good quality/emergency obstetric care. In Australia, in the triennium 2003­05, there were 65 maternal deaths (29 direct and 36 indirect) and 34 incidental deaths (see Table 43. Over the past five trienniums, the maternal mortality rates for Indigenous women were between two and five times the maternal mortality rates for non-Indigenous women. Definitions the World Health Organization definition of maternal mortality is the death of a woman while pregnant or within 42 days of the termination of pregnancy, irrespective of the duration and site of the pregnancy, from any cause related to or aggravated by pregnancy or its management, but not from accidental or incidental causes. It also includes deaths from assisted reproduction technologies where pregnancy has not occurred, but not from incidental causes. In most Australian states and territories, incidental deaths are included in the definition. Indirect obstetric deaths these result from pre-existing disease or disease that develops during pregnancy that is not due to a direct obstetric cause, but may have been aggravated by physiological changes in pregnancy. Common examples are complications of cardiovascular disease, renal disease and diabetes. Incidental deaths these are due to conditions during pregnancy where the pregnancy is unlikely to have contributed significantly to death. Maternal mortality ratio this means deaths per 100,000 confinements (including both live and stillbirths). The maternal mortality ratio in Western countries is approximately 6­10 per 100,000 (8. Contributing factors in those who died from haemorrhage were the failure to recognise the continuation and/or extent of the haemorrhage, delay in undertaking surgical treatment to arrest haemorrhage, and delay in blood transfusion. This includes variation in reporting, in referral for coronial investigation and quality of data on Indigenous status. It is estimated that for every maternal death in Australia, there are approximately 80 incidences of severe maternal morbidity, including haemorrhage, uterine rupture, renal failure and eclampsia. The seventh report on confidential enquiries into maternal death in the United Kingdom. London: Royal Society of Medicine Press Stover J, Ross J 2009 How increased contraceptive use has reduced maternal mortality. If a baby is born without signs of life, but also without maceration, there is a strong presumption that 226 44 · Perinatalmortality,birthasphyxiaandcerebralpalsy 227 death occurred during labour. There are exceptions in both directions, which require judgment on the timing of death in relation to the presumed onset of labour. The leading cause of death at 22­27 weeks gestation was the categoryofmaternalconditions(21. Perinataldeathsofbabiesat28­31 weeks, 32­36 weeks and 37­41 weeks were most commonly due to unexplained antepartum death. Blood volume rises from an average non-pregnant 2600 mL to 3800 mL at about 32 weeks gestation. The total red cell volume grows constantly until term from 1400 mL to 1700 mL, so there is a fall in haemoglobin concentration as gestation progresses. The peripheral resistance is lowered by a combination of increased vasodilatory substances during pregnancy and decreased sensitivity to vasopressor substances. Blood pressure falls in the first trimester and is at its lowest in the second trimester. Blood pressure rises to non-pregnant levels towards the end of the third trimester. Other factors affecting blood pressure in pregnancy include posture (via the supine hypotension syndrome) and uterine contractions, which raise blood pressure. Hypertension in pregnancy is defined as: · systolic blood pressure 140 mmHg, and/or · diastolic blood pressure 90 mmHg (Korotkoff 5) these measurements should be confirmed by repeated readings over several hours. Elevations of both systolic and diastolic blood pressure have both been associated with adverse fetal outcome and therefore both are important. Severe hypertension in pregnancy is defined as: · a systolic blood pressure 170 mmHg, and/or · diastolic blood pressure 110 mmHg this represents a level of blood pressure above which cerebral autoregulation is overcome in normotensive individuals. It is generally acknowledged that severe hypertension should be lowered promptly, albeit carefully, to avoid cerebral haemorrhage and hypertensive encephalopathy. Classification Classifications of hypertensive disorders in pregnancy are: · pre-eclampsia/eclampsia · gestational hypertension 230 45 · Hypertensioninpregnancy 231 · chronic hypertension · pre-eclampsia superimposed on chronic hypertension · essential · secondary · white coat Pre-eclampsia Incidence. While 20% of women are hypertensive at some stage of their pregnancy (blood pressure 140/90 mmHg), about 5%­10% of primigravid women and 2% of multiparous women fulfil a diagnosis of pre-eclampsia. Pre-eclampsia is a multisystem disorder unique to human pregnancy, characterised by hypertension and involvement of one or more other organ systems and/or the fetus. Proteinuria is the most commonly recognised additional feature after hypertension, but should not be considered mandatory to make the diagnosis. A diagnosis of pre-eclampsia can be made when hypertension arises after 20 weeks gestation and is accompanied by one or more of the following: · renal involvement · significant proteinuria: dipstick proteinuria, subsequently confirmed by spot urine protein/creatinine ratio 30 mg/mmol · serum or plasma creatinine >90 mol/L · oliguria · haematological involvement · thrombocytopaenia · haemolysis · disseminated intravascular coagulation · liver involvement · raised serum transaminases · severe epigastric or right upper quadrant pain · neurological involvement · convulsions (eclampsia) · hyperreflexia with sustained clonus · severe headache · persistent visual disturbances (photopsia, scotomata, cortical blindness, retinal vasospasm) · stroke · pulmonary oedema · intrauterine growth restriction · placental abruption Pathophysiology Two placental conditions predispose to the development of pre-eclampsia. Ischaemia results from the failure of the normal development of the uteroplacental circulation with the presence of small defective spiral arteries, which then may become blocked by acute atherosis or thrombosis. Excessive placental size also predisposes to pre-eclampsia, as seen in multiple pregnancy, hydatidiform mole, fetal triploidy and placental hydrops. Maternal contribution to pre-eclampsia occurs when endothelial activation results in acceleration of the normal systemic inflammatory response, which is present in all pregnancies. Activation of leucocytes and the coagulation process, and subsequent metabolic changes, result in the clinical features which are typically seen in pre-eclampsia: hypertension, oedema, proteinuria, platelet dysfunction, clotting derangements and possibly eclampsia. Placentation also depends on the invasion of the placental bed by cytotrophoblasts. Immune tolerance must occur in this setting to allow a continued relationship between the mother and the fetus. Hence, at least four factors are likely to contribute to the development of preeclampsia: placental, endothelial, inflammatory and immunological. Other factors associated with pre-eclampsia include chronic hypertension, preexisting renal disease, autoimmune disease, more than 10 years since a previous pregnancy, a short sexual relationship prior to conception, and other thrombophilias. Recurrence risk Studies of the risk of recurrent pre-eclampsia in women with a history of a hypertensive disorder in a prior pregnancy show variable results. Recurrence rates vary from 6%­55%, with the greatest risk in women with early-onset pre-eclampsia and chronic hypertension. An Australian study suggests a 14% risk of developing pre-eclampsia, and also a 14% risk of developing gestational hypertension in their next pregnancy. Clinical spectrum Hypertension Pre-eclampsia is a multisystem disorder with both maternal and fetal consequences. Hypertension may be labile, often with flattened or the reverse of normal diurnal rhythm. Many of the complications of pre-eclampsia are due to arterial damage and loss of vascular autoregulation. This causes a reduced glomerular filtration rate, which slows urate clearance and raises serum creatinine levels. Proteinuria is often a late sign of pre-eclampsia and indicates poorer prognosis for the mother and fetus. There is a reduced maternal plasma volume due to increased leakiness of capillaries, and hypoalbuminaemia predisposing to reduction in colloid oncotic pressure and raised fluid in interstitial spaces. The complications of fluid changes include pulmonary and laryngeal oedema, and acute renal failure. Platelets the reduction of platelets in pre-eclampsia is due to increased consumption and lowered platelet lifespan. Disseminated intravascular coagulation is a late and inconsistent feature of pre-eclampsia. The complications of coagulation/clotting changes include disseminated intravascular coagulation with widespread fibrin deposition, haemorrhage and necrosis. Hepatic changes · Liver dysfunction with elevated hepatic enzymes is often evident. Raised alkaline phosphatase is normal, due to the placental production, although raised transaminase levels reflect hepatic ischaemia of pre-eclampsia. In women who had experienced a stroke, 96% had a systolic blood pressure >160 mmHg, 21% had a diastolic blood pressure >105 mmHg and 13% had a diastolic blood pressure >110 mmHg; mean arterial pressure was >125 mmHg in 46% and >130 mmHg in 21% of women who had experienced a stroke. Acute arterial hypertension can lead to damage to the blood­brain barrier with extravasation of fluid into the parenchyma resulting in cerebral haemorrhage and infarction. A mean arterial pressure of 140 mmHg (blood pressure 180/120) is an obstetric emergency and requires immediate treatment. Placental and fetal involvement Abnormal placentation reduces uteroplacental blood flow by changing the uteroplacental circulation from a low-resistance system to one of high resistance and underperfusion. The complications of this to fetuses are intrauterine growth restriction, death and complications of prematurity, when delivery is indicated. Management of pre-eclampsia Pre-eclampsia is a progressive disease that will inevitably worsen if pregnancy continues. Current therapy does not ameliorate the placental pathology, nor alter the pathophsiology or natural history of pre-eclampsia. Delivery is the definitive management and is followed by resolution, generally over a few days but sometimes over a much longer course. Prevention · Prophylactic therapy with aspirin is associated with a reduction in the recurrence rate of pre-eclampsia, delivery prior to 34 weeks gestation, preterm birth and perinatal death. Risk reduction is greatest if therapy is commenced prior to 20 weeks gestation and if doses >75 mg are taken. At present, therefore, there is no evidence for this treatment in the absence of a thrombophilia or antiphosphlipid antibody syndrome. Investigations · initial assessment may be in a day assessment unit, unless severe hypertension, headache, epigastric pain or nausea and vomiting are present, which necessitate urgent admission · urine dipstick testing for proteinuria, with spot protein/creatinine ratio if >1+ (30 mg/dL) · full blood count · urea, creatinine, electrolytes · liver function tests 45 · Hypertensioninpregnancy 235 flow Additional investigations that may be useful in certain women include urine microscopy on a mid-stream specimen, coagulation studies, blood film, lactate dehydrogenase, fibrinogen, investigations for underlying systemic lupus erythematosus, renal disease, antiphospholipid syndrome, thrombophilias, fasting plasma free metanephrines/normetanephrines and 24-hour urinary catecholamines. Indications for delivery in pre-eclampsia or gestational hypertension Antihypertensive therapy Severe hypertension · ultrasound assessment of fetal growth, amniotic fluid volume and umbilical blood For indications for delivery in pre-eclampsia or gestational hypertension, see Table 45. A Cochrane review has concluded that there is no good evidence to support the use of any short-acting agent over any other and practice should therefore be guided by local experience and familiarity. Mild to moderate hypertension There is controversy regarding the treatment of mild to moderate hypertension in women with pre-eclampsia. However, a small placebo-controlled study looked at treating women with mild hypertension. Placebotreated women were delivered significantly earlier, mainly as a result of severe hypertension or premonitory signs of eclampsia, and there was more neonatal morbidity secondary to prematurity. In the absence of compelling evidence, treatment of mild to moderate hypertension in the range 140­160/90­100 mmHg should be considered an option and will reflect local practice (see Table 45. Intravenous fluids Although maternal plasma volume is often reduced in women with pre-eclampsia, there is no maternal or fetal benefit to maintenance fluid therapy.

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